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Lunev" To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, "Denis V. Lunev" , Stefan Hajnoczi , Alexander Ivanov Subject: [PATCH v7 01/25] parallels: Set s->used_bmap to NULL in parallels_free_used_bitmap() Date: Thu, 3 Sep 2026 16:41:19 +0200 Message-ID: <20260903144143.2328870-2-den@openvz.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260903144143.2328870-1-den@openvz.org> References: <20260903144143.2328870-1-den@openvz.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::430; envelope-from=den@openvz.org; helo=mail-wr1-x430.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Alexander Ivanov After used bitmap freeng s->used_bmap points to the freed memory. If we try to free used bitmap one more time it leads to double free error. Set s->used_bmap to NULL to exclude double free error. Cc: Stefan Hajnoczi Signed-off-by: Alexander Ivanov Reviewed-by: Denis V. Lunev Signed-off-by: Denis V. Lunev --- block/parallels.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/parallels.c b/block/parallels.c index 50748d1415..94692275c9 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -254,6 +254,7 @@ static void parallels_free_used_bitmap(BlockDriverState *bs) BDRVParallelsState *s = bs->opaque; s->used_bmap_size = 0; g_free(s->used_bmap); + s->used_bmap = NULL; } static int64_t coroutine_fn GRAPH_RDLOCK -- 2.53.0